卫星扩频通信中频域PN码捕获的FPGA实现  

The Implement of PN Code Acquisition for Satellite's Frequency-Extended Communication Using FPGA

作　　者：任前义[1] 帅涛 赵国栋[1] 

机构地区：[1]中科院上海微小卫星工程中心,上海200050

出　　处：《上海航天》2008年第2期61-64,共4页Aerospace Shanghai

摘　　要：为提高低轨卫星扩频通信系统的捕获速度,在直接序列扩频系统中采用频域捕获方法,并提出在伪码寄存器全1状态后添0的方法以解决伪码与快速傅里叶变换(FFT)运算长度的不匹配。系统采用流水线、乒乓操作和频率步进等技术实现,最优化了占用资源和最高处理速度。仿真结果验证了方法的有效性。To shorten the acquisition time of frequency-extended communication system in low-orbit satellite,the acquisition in frequency domain was applied to direction-sequence-spread system.The method that adding zero after the PN code registers were all one,which would solve the length of PN code mismatching of fast Fourier transform transfer size,was put forward in this paper.The system was implemented using pipeline,ping-pang RAM and frequency step that the hardware resource was reduced greatly and the high spee...

关 键 词：低轨小卫星 捕获 直接序列扩频 相关 流水线 乒乓操作 

分 类 号：TN927.2[电子电信—通信与信息系统]